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. 2016 Sep 30;10(9):13–25. doi: 10.3941/jrcr.v10i9.2885

Figure 4.

Figure 4

Resting NLC (left) and NLC with isometric anterior head flexion (right) x-ray views of subject 7B (a 24-year-old female weighing 101 pounds). Radiographic settings include: 30 mAs, 200 mA, 68 kVp with a 72 inch FFD, CR at C4, and 7 inch by 10 inch cropping. Chamberlain’s line is the blue line originating at the posterior aspect of the hard palate and ending at the opisthion of the skull. The APL is the blue line drawn through the anterior aspect of the anterior aspect of C1 and the vertical center of the posterior arch of C1. The red lines represent the actual posterior tangent of the cervical vertebral bodies from C2–C7 of the subject. The green line represents the ideal spinal curvature as defined by the Harrison Spinal Model. The artifacts located anterior to C3–C5 bodies are the sEMG sensors. The artifact located inferior and anterior to the chin is the dynamometer.